I am fond of working buttonholes as they let one roll up the sleeves of a jacket. This serves me quite well during tough late night M&A negotiations - slowly unbuttoning and rolling up one's sleeves looks the bit and psychologically impacts your adversaries. Just make sure the jacket is cut with enough fabric to allow this.

If I'm ever negotiating a transaction with someone and they start rolling up their fucking suit sleeves I'm going to burst out laughing at them.